say i have 1 year old domain , in that case which is best . also in your opinion is blogspot is effective , means to say if we want to start 100 sites , which is the best way buy 1 domain set up 10 sub domain , or 100 blogger website.

Well if you want to actually see results and make money then buy 5 domains. The only real use for subdomains these days is creating link farms with wp multisite otherwise they are pretty much a waste of time to be honest.

It may cost a bit more to get started but you'll recoup that very quickly

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